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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets $ 2,986   $ 2,565
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects 1 $ 1  
Limited Partnerships and Limited Liability Companies [Member]      
Variable Interest Entity [Line Items]      
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets 1,900   1,900
Carrying Amount Of Investments In Qualified Affordable Housing Projects 8   $ 13
Maximum exposure to loss related to unconsolidated VIE's $ 0